Quote from NoDoji:
Here's some advice from Mom (remember, mother is the inventor of necessity):
1) Determine a max daily loss and honor it no matter what. Mine is $500 on a $50K trading account (though I may modify that if I start trading oil in the live account). If I've blown $500 and the day's not even over, it means either a) I'm not patiently waiting for my best setups, b) I'm chasing entry too far past the price where the trade was signaled, c) I'm revenge trading or overtrading, d) I'm trading too large, e) I was trapped in trading halt that moved against me when trading resumed, f) I suffered huge slippage when news/rumors moved price rapidly against my position and blew through my stop, or g) I made serious order entry errors that only became apparent later on. No matter which of these reasons resulted in the loss, the size of the loss places me in a state of mind that is very poor for successful trading and I call it a day. I can easily recover from a $500 loss when my mind is fresh. Not so easy once the loss becomes larger.
2) Trade with the trend, play breakouts with very tight stops (they work well quickly or they fail and reverse), counter-trend trade ONLY when a reversal signal is put in (lower high or higher low).
3) The less room you allow for losses, the more honed your trading skills will become. If you trade 200 shares of a $100 stock and you only allow a .30 cent move against you, you will learn to choose entries wisely, because you'll get tired of getting stopped and chopped.
4) IF you want to enter a trade early before the entry has been confirmed by the price action (because you're afraid you'll miss a move), or IF you want to average into a position that's running counter to the direction you want price to go because you believe price has gone too high or too low and will definitely reverse: Ask yourself where you would place a disaster stop. What is the level that you're almost certain price will never get to? THAT is the price zone where you should actually look for a reversal signal. Price will get there, I assure you.